Method of electrical distribution.



No. 7|7,5l5 Patented 1m.- 30, I902.

. J. s. STONE.

METHOD OF ELECTRICAL DISTRIBUTION.

I (Application filed Nov. 17, 1902.)

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UNITED STATES PATENT EFICE.

JOHN STONE STONE, OF CAMBRIDGE, MASSACHUSETTS.-

METHOD OF ELECTRICAL DISTRIBUTION.

, SPECIFICATION forming part Of Letters Patent No. 717,515, datedDecember 30, 1902'.

Original application filed August 4, 1902, Serial No. 118,210. Dividedand this application filed November 17, 1902. Serial Ila-131,644. (Nomodel.)

To all whom, it may concern:

Be it known that 1, JOHN STONE STONE, of Cambridge, in the county ofMiddlesex and State of Massachusetts, have invented a new and usefulMethod of Electrical Distribution, of which the following is aspecification.

My improvement relates especially to a method of electrical distributionin which vibrating currents are employed and it is desirable to useautomatic relays in the circuit.

In a companion application hereto, Serial No. 118,210, of whichapplication this is a division, I have set forth at length thedifficulties which arise in the use of such a method when atransmitting-generator develops currents of the same frequency as therelay-generator, and I have therein described and claimed, broadly, mynew method of electrical distribution by means of which the difficultiesreferred to therein have been overcome,showingalsovarious means bywhichthe said method may be carried into efiect. In the said application Ihave also claimed a specific method of distribution in which the energyof the current is directed from the main line into the local resonantcircuit containing the relay by means of an inductancecoil.

My present invention consists in another method of distribution whereinthe energy of the current is directed from the main line to the localrelay-circuit by a condenser of a larger capacity than the condenser ofthe relay-circuit.

My present invention will be understood when described in connectionwith the drawing, in which the figure shows diagrammatically theconnections and apparatus by means of which my method may be carriedout.

The drawing shows a two-station circuit, though it will be evident tothose skilled in the art, especially after comprehending the broad scopeof my invention contained in the above-mentioned applicatiomthat themethod may also be utilized with more than two stations, a relay-stationbeing supplied for each pair of transmitting-stations. The stationsshown in the drawing are marked 1 and 2, 3 being the relay-station. Thestations 1 and 2 each consist of a transmitting apparatus and areceiving apparatus. The parts forming the transmitting apparatus atstation 1, as shown,- comprise a key 70'', one terminal of which isgrounded, the other being connected with means for impressing avibrating current on the line, such as an alternating generator 9. Thisalternating generator is also connected with a condenser c, which isconnected with the main line A by means of an inductance= coil "1". Thereceiving apparatus at station 1 comprises, as shown, an electromagnet8, one terminal of which is grounded, the other terminal being connectedwith a condenser o which is connected with the main line A through aninductance-coil r. The station 2 comprises similar instruments, thetransmitting instruments being indicated, respectively, by the letters70 9 c and r and the receiving instruments by the letters e e r.

The relay-station 3, as shown, comprises a condenser C in the main lineA, having a relay-circuit R looped about it, the loop containing a relayR an inductance-coil T and a condenser o of less capacity than thecondenser C The local circuit L of the relay in this case is also a loopcomprising an armature a in the field of the relay R means fordeveloping a vibrating current 9 an inductance-coil r located, as shown,between the generator g and the main line A, and a condenser locatedbetween the terminal 01": the armature and the main line A, a condenserC of large capacity compared with the capacity of the condenser 0 beinglocated between the two connections of the loop of the localrelay-circuit L with the main line A.

When my method is carried out by means of such apparatus as is shown inthe drawing, the generators g g are such as are capable of developingcurrents of the same fre-.

lay-station, but cannot of itself affect the receiving instrument e atstation 2, as that instrument is not resonant to the frequency of thegenerator g. The closing of the armature u however, causes the efiectiveoperation of the generator 9 which, developing a current to thefrequency to which the circuit containing the receiver e is attuned,causes the receiver 6 to receive the signal without, however, in any wayaffecting the continued and intelligent operation of the armature a atthe relay-station. In this arrangement the condensers O C serve todirect the energy of the current into the local resonant circuitcontaining the relay, and in order that they may do this effectivelytheir capacity should be greater than the capacity of the condensers c 0which are in the two loop-circuits at the relay-station.

What I claim as my invention is 1. The method of absorbing the energy ofcurrents of one frequency traversing a main line to the exclusion of theenergy of currents of other frequencies traversing said main line, whichconsists in diverting the energy of the current of said frequency bymeans of a condenser included in said main line into a local resonantcircuit associated with said main line and containing a tuning-condenserof capacity very small compared to that of the said condenser includedin the main line.

2. The method of absorbing the energy of currents of one frequencytraversing a main line to the exclusion of the energy of currents ofother frequencies traversing said main line, which consists in divertingthe energy of the current of said frequency by means of a condenserincluded in said main line into a local resonant circuit associated withsaid main line and containing a tuning-condenser of capacity so smallthat its reactance shall swamp the effect of the reactance, in saidloop-circuit, of said condenser in the main line.

In testimony whereof I hereunto set my name this 13th day of November,1902.

JOHN STONE STONE.

Witnesses:

GEORGE O. G. CoALE, M. E. FLAHERTY.

